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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7d5197c78aac256343670d99001839405a86dc43456e192acfd42a325e8510' 
  AND token = 'vHY3erQW9L18IyK0toVjRUkk0sfeAeFjx5nEFEHcwp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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