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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03a0a51251dfc7fe9cc24c901a181e95fc3ee33682ac41fabaf811efd903b68' 
  AND token = 'HBX/EUdExa2tykls8aptDjYV2FQDX5dj1nnUruis5hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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