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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a13dfb59b97778893441c41e1ed1ddff978fef49bf538d16b6b260e3926f97f' 
  AND token = 'tDGTU3kekJK2FXfVm0x2Dk67ZU3+xOXzdWZ/3asUpOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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