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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11bc59d78d581c0c32ff58fead1187a40c8e8c2afce705b99eb5f38b6af87b1f' 
  AND token = 'aKYKuXxOttKLDJy19PFQae+i/5mFVx1B+6J7Fc8ripU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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