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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8353bac473dbc5bcdb893812e6457b62cf5c6b121b84f96cf8163781f35a1b79' 
  AND token = '58JTmeWfZLJkgY+V8NOuqysGkot8oZ1UbmJ3HoWhsXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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