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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9c4e7f114efeb35a94d31c191a4c639e9a8993c3142a5ac14e9873e1862f35' 
  AND token = 'vaT4Q6xr/yeeAn3oHENITDqtF0EmNUozAZfcLC1QsZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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