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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee4af1dc26c4714f55aefb41ea774f3f14c7476eb1c4bcf870a64f75ef4f19a' 
  AND token = 'whW79NYejAzVdLoidbsnlrpx/XfHdOj3qV8S8gMfmQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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