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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6b30de5764dedaf12e60595c99c64010469270318d79bf630f03e2763990f1' 
  AND token = 'QDWtjZNwQsfA2hnEOmj+P47QqtWu8VzHMsT6CHF0/Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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