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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd950361cc3c622de69e867b8e99981cc14ca7391c3531144915900462c1cdc75' 
  AND token = 'aQs0WHJK6bpiJuc8u4x8AAGK/2mcAZdfBH52F2vigUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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