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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb6cb33fc0d722e3da7c488b668219de0ab0c67e1012ceb75d3c4bfa139327bd' 
  AND token = 'WoZ7K8Kwxa5DehYMkxXZmmrEZIkcb1gztiQ3xUCJgAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}