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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a312ad2e4f29a017d0a17b2c184b3dc5650d4ae504ea5977cebeb36e2b6e9c4b' 
  AND token = 'UudRJYYJrhbXn7cUobhcOSbfc7cXKbleUfpF1kCVjzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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