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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c792211b0297d5745db17f4583ad5d704fed8cf68f126fe926f95dfe039ac2' 
  AND token = 'unPEe5zgyxSP+A+ASRDkbWwekHG03JUpFh0sf8jzk88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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