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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af031f64bb2fd92c121510b03e89cf227e6338c43115825f03a5a271927c778b' 
  AND token = '4UwBGNC1TN+zJ/9mR13/H1vTHI7detX7Cn4BgSknQyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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