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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cba5b897f01b75d799d1d30e34f8a001c8712667a10dadabacdf0c98f8e2bb1' 
  AND token = '4zcJ1SwtOrMuuLgb8OeGIbREDYalMPuaYZm/23EXE30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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