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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ca1237c1bf732afd643af27be98df7b784386f002de7d00b679e8e33ed17a6' 
  AND token = 'SJSM4cw9PfEOmQMhAFwV7vEJa4e587qif6lmib4jiVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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