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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdeca4c994c68ba46dd6030b3733da0e25c56cbac31a65b9bb40d0da0a552861' 
  AND token = 'pxbJENw1U4kNStaLuDn7CTd2jHCl0PhdlZiZO9MMljU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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