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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bb46298b3817b5edc4d7d093206cc07b057d39f0569300cd7fbfc1a649ad161' 
  AND token = 'zieVqlAYZr9O1IvPgDA5hkC3NGDGa6gw6Jd2xI0WoTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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