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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82748b2969d340228eaa79820b1cc8386bc48c810b28d6ceca4c893ef726d67b' 
  AND token = 'hcmPvPMGyMV/oaNdUkc1ocugF56GuNeHKafY0snmRBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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