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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9637795fc8481d50fe5b15f163908a9e955381d8797596c3c5d6bdb7b25d1d2' 
  AND token = 'vIP6Ut9E+Qr559DvZCjpCajpN6ZkkhtgdQjfr7qFERU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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