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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207e8cd3b49e316b1f1973b2e98fc0b050bbab866a269171c5fd74e6d092a680' 
  AND token = 'vHSpfolRzE2eGhRwEekmxHeEtROOSfM/gq4cxF+lbCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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