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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f739bc2d7091c139f20fe3975a01ae0b44ea39409b94678ac5708977a079f2b9' 
  AND token = 'm4+Lnv38a4j5SgVXtvumMHSpZolelfLz+7zjpcfz8p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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