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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa852175d5781909a9c642481965c259dc6dd39c299e87d50d7fb1d17d8648c5' 
  AND token = '0bZyXRaDZQP4iiFZBtsAAFaMtYVFfGP10J1DT0672ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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