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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a5750e31b29d6c5638f496cc2469c12079e3e794c0cc3990d61a2f81c93392' 
  AND token = 'uiDU0qpp4m+TSZmRGHPCjfG3Hui6mLtRepLTkQFwyrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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