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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931977313c57b120876c05cb951e55b5df3a7a5b575bfb7c045a5801d500ff56' 
  AND token = 'luPasLMLPXVE+RHJYAu3IqOJfUgtghFhmtcA0QgC0vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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