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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbeaedb434c995455f0a496bb00dd4924b062c47d1769bebcaec0749fc2d1a0d' 
  AND token = '/iL5jUQ/n8DJq7gX9GkD2h7S6uubXMeYVAzVzzVNjOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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