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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb733f3139cb2239314631f1c49a21fdf4e76dcf532ef3306e5c8dc7d3e3ea1' 
  AND token = 'QK2WaxZE5ewClVsuLMWjr6aZ6EaqA4e4rAJKasisVKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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