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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bf0258df9bfa05e185ac52471d32784ef53c35f930a8c4182b15ed48a92aff' 
  AND token = 'FWKRf5neKzpVrY9adVWpvhhMcd2Z3NjkiGf/+Aojq0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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