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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b58e4835347a3188f2f39acff056dada3c2ebd21fbe6df157f2e207f5dd2603' 
  AND token = 'JxznLptKHQ05dwvexb5TDS3q8ij7NFxgjJPSxq5ajP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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