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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7f77a37d85df42e5d513a2f1e3b7628e205155dc51ff2ce4754d369ef1b9fd' 
  AND token = 'p7yA2Z2zU6sQTyZ6GWfa4HZazpRfor/bt5RTV3YGHLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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