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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b033b08cf2cfdcbbd29d8e4e9d58822b5dd00bdbf40be26d867b96b5821bd7e' 
  AND token = 'ABA+NSKYmqTcs53Dmxa3xF5/wPpFoVixF2dxUgZU7rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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