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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99a6e59351134a71004a12b453ce2ad8e2cad263c64962944b5a3c891d9e647' 
  AND token = 'EaErsih0566Oq8m8cKnGrzMjs1ryqd1CJQLZ5NHMvNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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