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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e247511ceddbcd52b30d8a7a3bf016a37d307a48034b69813d32dce1749bdf6' 
  AND token = 'Qzon3UXNAVR31Kn3Em6ScL7Oa9m1rDmQRMEXobA24wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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