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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e155509b8375a7ec0d5684333b5c83f3b9418e575d517765dda226850eda3f6d' 
  AND token = 'yhD9H6qQEAXyGZJiHubAQwifNrLK9a5uGNiJXHsvBUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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