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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf027225c6c3823822383a708bae04b1500cca52d45c7413a5cc11f80207d9c' 
  AND token = '0X8hg9s4GbkWCOPygECmJP+pqBKaKiozf/9PF3RJBa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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