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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd4e5bd7b42ded380c1476f22df837ae4c49cfbb3fe37c6bbdcaa8ac9ee9132' 
  AND token = 'Fd+aJd4An0zy+u0wijbmI3IYSKJXyDWCqdf0MXJ/hos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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