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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df6aaa4191c98c47d8af7209cc7dee3edbec7af0d8268ba288389a9cc90673c' 
  AND token = 'bPdj2YZqXSUbCqLNvdIZ7b0D8O7CR+Dt6QqDX5NALIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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