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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f32e6d168926d31409abca84bb685373af2dd2b9dc76d5eb462a0d39826a6d' 
  AND token = 'JHBo6rRo8XXDH76G666XQC60T8QnUPn/eH+/emRRCE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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