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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94daa7f622cd2cd49404e6c3bedd9e77a527cf84fd6b19cfa1456c80bf3200c7' 
  AND token = 'fiFjUpYrik3LvtTyP/qwQWcsc/0drgR9kSA5ZuCtkQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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