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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0938c3ac6dc31527bee9d57f872d7a5403dd8f559e8f1cd903d91d81c81afdfb' 
  AND token = '394rJXa/KM1TY9X69RdFHM9gDkf92Ql1FZTJ5fAoYbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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