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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c05342e3a803ba361725b8d7ef5e6aca01d2b9c4aa988562d66897ba544958' 
  AND token = 'DUlwUd6oMGakJwdvTG5BwxwkuttMg7gtYv6DP7VZGDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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