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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9dbb4d20b2295a95022d5bbaf829915e44d7d98505da6a5a28c0de2290d8744' 
  AND token = 'Fo7WPnqFTO6ad90E8Thjub4pdBHtlEVMq7zwrr5pTDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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