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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8fb4596388640c87f5f18e81affc30acfc1cd7971a869ed8519b1e78e6df4c' 
  AND token = '5mD5nNqwu7bJTmgyDelGpjaIype6xdMv5IFD1k8Crks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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