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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ebc7168b52964b481e8958e3d6b1da2f421356e6242feaae9af68e49b29beb' 
  AND token = '6G0RMoj8fgOpsRAQUOL19QNRMvFL37WO0n/tbIOPC/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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