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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32bc8dcd66bc8c6b119a9d1b4f207a30258257a512d396706923173c83d6962f' 
  AND token = 'NHnehCqy/TbT9Lz3OdC9boWEPE2XgW+xsISwLPWtR3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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