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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa85db18343e68e56af9efd761e451718ced7cf315eea42b7110db1016b25890' 
  AND token = 'G8nxsB8fDXcsazdQ6od6dqBpYmuIvKvOtf0EfkWlZTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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