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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1abe90b9eb678548c37b15cc7ee9682e42bd395dd195fb8fe49a4fe9d10b6c' 
  AND token = 'qU5xVUjAC9tXOd7CsoiI+O4nAFU/rlnJSxMwOlJkY9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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