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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '189c06e48897d6b19968eab36888cbadbe2f47ec40bac79a1fe983ee0179aa2b' 
  AND token = 'Gcni9iJ7Cus364FZDhelo8F7pPvg7ksABjGhTI72k5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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