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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30d15e462cea71bceb8721f33fa466a85d48f54218dec202b571b261c339733' 
  AND token = 'i5hOdVw16BvqCesBGd3TkiXL3v4iSK/iV7+LJ6avMtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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