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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb693ed84a737e11cb11333e42fcff8ddaf86d5dc1cf3baad7966d09f36b102' 
  AND token = 'CCTI0qSIImFqtZM6r7vNTmg1PG/RkXGmJQ5+yVCZkEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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