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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1232a260a69d6e783129a8d3d815e507bb06cb9fcb17ab6c7a11330a6fa8f1' 
  AND token = '+Mu4gprrzpZ7UYGoyW9Yy5de4eAQNlxkEqdq0vUB4yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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