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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd3175d53a4e36c0f45f9079f9a997cab9b6d667359394b7501d884a3c063cd' 
  AND token = 'GQAIOaHpZRE3so2NuHxDHuGA1neCTu/JnC/e6g/U698=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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