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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08e2be1901d143a770e4400d9038d98135aa93621164a32b1a53393867a042a8' 
  AND token = 'mD2iUzuRxTLHWspWVc9GXfIOLkNi24suT1t9wvem92g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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