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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651742fbde23de4b6c85a2c96babeb9ff4ddf1c447e68c45cf44aef5589e1bd5' 
  AND token = 'OT2fcehkUX2fU5+8CjvwI9AppE/3DWhSvqpZ6/mqfM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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