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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4beed59df63232be146d9b505542c6e6edf11a2aaadf2c3da244ea3cff56b9c7' 
  AND token = '/r98wsy7Jbqo6eTnuH7nOhi3WJQtUQNspoWpfS3JXQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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