SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0261e4fcf66504e5cf3ab69219d63f39bab2bc3f7f9558ba04dc83275e064f' 
  AND token = 'CL+zpFPZ6nO1lwriK4xih/ufe57EeBR+W7N3YEkDFZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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