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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d2923b8de77d167be888c89e32a407a27ac8f36122e5b8403c516503563912' 
  AND token = 'ELPT3xgent4s2AclPgh0u3kvbl/xHlXQZAjoweJXrGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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