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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f912ba8c14aabf66798f2b3903b175726d41497577abee4b09f61aa763389ddb' 
  AND token = 'sfHqx1V/VWnTaT55kgkAArs28ZFsrqit/92DJX+qLf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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