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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '738c5ab14f60820ec9e6be201df7e0a0306a610ee3b4a57cfcc01b0346d4a894' 
  AND token = 'Ch+OAsfngBK7giUusC73iHeq127Of8RlVuHH3s9sIxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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