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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598d75373c2da3a89d0ea0ef6d1c3e1076619dfbddb6a1ed91e41e1d108bbec5' 
  AND token = 'LYP1NggwMYSFcc1WjQ/HwgldBWFQuDCUAXK7Yf6NWPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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