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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53aeaf95f87f9776a1a2bd4a4a1d4ca4d436c743318fcdbab5d6c3a5a66605e2' 
  AND token = 'g+hijoU3V2DI8vxBLk0FTZDobaTIXcK3QcSVpWSYT98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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